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Broker Requirements

The broker needs to fulfill the following requirements:

  • Supports MQTT 3.1.1.
  • Supports QoS 0.
  • Authentication: None, Username+Password, Client-Certificate.
  • Security: None, TLS 1.2.

The list of supported TLS ciphers can be found here: Cellular IoT Communication → Root Certificate and Cipher Suites.

RSA Key Length limitation

We recommend using elliptic curve certificates due to their compact size. If you prefer using RSA, please note that the gateway’s crypto hardware (Arm® TrustZone® CryptoCell 310 (CRYPTOCELL)) is limited to 2048-bit key lengths.

MQTT topics used by the device​

The default topic prefix is LOB, and can be changed via the Host parameter.

The device subscribes to the following MQTT topics:

  • [topic prefix]/[DevEUI]/down/#

The device publishes to the following MQTT topics:

  • [topic prefix]/[DevEUI]/up/+
  • [topic prefix]/[DevEUI]/req/+